{"id":"F2007L02180","name":"AD/CL-600/73 - Main Landing Gear Main Fitting - 2","slug":"ad-cl-600-73-main-landing-gear-main-fitting-2","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":67404,"registerId":"commonwealth-F2007L02180-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bombardier (Canadair) CL-600 (Challenger","sectionType":"division","heading":"Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes","content":"### Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes\n\n| AD/CL-600/73 | Main Landing Gear Main Fitting - 2 | 8/2007 |\n| ------------ | ---------------------------------- | ------ |\n\n| Applicability: | Model CL-600-2B19 aircraft, equipped with main landing gear main fittings part number 601R85001-81 and 601R85001-82 (MDI part number 17064-105 and17064-106).                                                                                                                                              |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the requirements of Transport Canada AD CF-2003-09.Note: Bombardier Alert Service Bulletin A601R-32-088 original issue, or later Transport Canada approved revision, refers.                                                                                                     |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of2 August 2007.                                                                                                                                                                                                                   |\n|                | This Airworthiness Directive becomes effective on 2 August 2007.                                                                                                                                                                                                                                           |\n| Background:    | To prevent the collapse of the main landing gear upon landing, this Directive requires repetitive detailed visual and eddy current inspection of the main landing gear main fittings, and repetitive inspection of the main landing gear shock strut, for nitrogen pressure and visible chrome dimensions. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n22 June 2007","sortOrder":0},{"sectionNumber":"AD/CL-600/73","sectionType":"part","heading":"AD/CL-600/73","content":"## AD/CL-600/73","sortOrder":1},{"sectionNumber":"Main Landing Gear Main Fitting - 2","sectionType":"part","heading":"Main Landing Gear Main Fitting - 2","content":"## Main Landing Gear Main Fitting - 2","sortOrder":2},{"sectionNumber":"8/2007","sectionType":"part","heading":"8/2007","content":"## 8/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"This AD adopts the requirements of Transport Canada AD CF-2003-09 and Bombardier Alert SB A601R-32-088 for CL-600-2B19 aircraft with specified fitting part numbers. The text announces a revised effective date of 2 August 2007 (Compliance) but does not expand the range of aircraft, part numbers, or inspection obligations in this instrument itself."},"complexity_factors":["Cross-reference to external mandatory documents: Transport Canada AD CF-2003-09 and Bombardier Alert Service Bulletin A601R-32-088 (Requirement).","Narrow technical applicability requiring identification of specific part numbers 601R85001-81 and 601R85001-82 (Applicability).","Multiple inspection methods mandated (detailed visual and eddy-current) plus shock-strut checks for nitrogen pressure and visible chrome dimensions (Background).","Repetitive inspection regime implies ongoing operational and maintenance costs for affected operators (Background; Compliance).","Regulatory timing element: revised effective date specified (Compliance), which affects implementation scheduling.","Enforcement and delegation: issued by the Civil Aviation Safety Authority delegate—operators must follow externally-sourced requirements adopted into this AD (signature and Requirement)."],"plain_english_summary":"This Airworthiness Directive requires operators of Bombardier CL-600-2B19 aeroplanes fitted with main landing gear main fittings P/N 601R85001-81 and 601R85001-82 to carry out repetitive detailed visual and eddy‑current inspections of the main landing gear fittings and repetitive checks of shock‑strut nitrogen pressure and visible chrome dimensions (Applicability; Requirement; Background). It enforces the actions set out in Transport Canada AD CF‑2003‑09 and Bombardier Alert Service Bulletin A601R‑32‑088 to reduce the risk of main‑gear collapse on landing."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive maintaining its original narrow scope — mandating specific safety inspections for a defined aircraft type and part number. No scope creep evident."},"complexity_factors":["Short, single-purpose directive (approximately 200 words)","Only 2 specific part numbers in applicability section","Single requirement referencing external document (Transport Canada AD CF-2003-09)","No defined terms section — relies on standard aviation terminology","No nested exceptions or conditional logic","Simple compliance structure with single effective date","Cross-reference to one external airworthiness directive and one service bulletin"],"plain_english_summary":"This CASA Airworthiness Directive mandates repeated inspections of main landing gear fittings and shock struts on specified Bombardier Challenger CL-600-2B19 aircraft with the identified part numbers. Inspections include detailed visual checks, eddy‑current testing, shock‑strut nitrogen pressure checks, and chrome-dimension measurements to detect fatigue or wear that could lead to gear collapse on landing.\n\nOwners and operators of the affected aircraft must comply with the inspection schedule referenced from Transport Canada AD CF-2003-09; the directive took effect 2 August 2007."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-73-main-landing-gear-main-fitting-2","history":"/api/acts/ad-cl-600-73-main-landing-gear-main-fitting-2/history","analysis":"/api/acts/ad-cl-600-73-main-landing-gear-main-fitting-2/analysis","conflicts":"/api/acts/ad-cl-600-73-main-landing-gear-main-fitting-2/conflicts","importantCases":"/api/acts/ad-cl-600-73-main-landing-gear-main-fitting-2/important-cases","documents":"/api/acts/ad-cl-600-73-main-landing-gear-main-fitting-2/documents"}}